Vulnerability in Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker — CVE-2026-96558

What to do now

Update Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker to 11.2.7 or later.

Affected versions

• Everything up to and including 11.2.6

The Quiz and Survey Master (QSM) – Quiz Maker & Survey Maker plugin for WordPress is vulnerable to Stored DOM-Based Cross-Site Scripting via the 'qsm_hidden_questions' parameter in all versions up to, and including, 11.2.6 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This requires the attacker to force the mlw_results INSERT to fail by submitting an over-length or duplicate qsm_unique_key value, which triggers the audit trail code branch that writes the unescaped payload to wp_mlw_qm_audit_trail.form_data.

This description is reproduced verbatim from the public vulnerability record.

• https://www.wordfence.com/threat-intel/vulnerabilities/id/0e344974-08c8-45a5-a0f4-3780ce00928b?source=api-prod

Part of this record comes from Wordfence Intelligence. Original: https://www.wordfence.com/threat-intel/vulnerabilities/id/0e344974-08c8-45a5-a0f4-3780ce00928b
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